海流兔河径流量年内分配及变化趋势分析

Annual Runoff Distribution of Hailiutu River and Its Change Trend

采用不同方法对黄河中游典型风沙滩河流海流兔河1957～2007年的径流资料进行了分析。采用年内分配不均匀系数法分析表明，海流兔流域径流年内分配均匀，集中度低。应用Mann—Kendall秩次检验法，证明年径流序列存在明显下降趋势。而同时期的降雨量不存在显著的趋势。且降水年内分配十分不均，主要集中在夏季的7-9月，冬季少雨。利用情势变化指数法（RSI）分析得到海流兔河年径流变化的几个阶段分别为1957～1967年、1968—1988年、1989—2000年、2001～2007年。通过对比降水资料和径流资料的变化趋势和年内分配，发现降水对径流变化的影响不明显。

This paper analyzed the runoff data of the Hailiutu River, the middle reach of the Yellow River, from 1957 to 2007 with various methods.. According to the analysis by the non-uniform coefficient method of annual streamflow distribution, the annual runoff distribution of the Hailiutu River is quite uniform with a low concentration ratio. The annual runoff series was found to have a significant descending trend by using the Mann-Kendall test. And it was found that the precipitation in the same period has not obvious with non-uniform distribution of the annual precipitation. The precipitation concentrated in July, October and September. With the regime shift index （RSI） method, it was found that the annum runoff change can be divided into the durations as follows： 1957-1967,1968-1988,1989-2000,2001-2007. By comparising the trend and annual distribution of the runoff and precipitation, the conclusoin was made that there is no obvious impact of precipitation on runoff in the Hailiutu River Basin.